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Level of Contamination by Threat

  • Sampling points within the in-water segment that meet observed release criteria are likely to give different levels of contamination for three threats. This is for two reasons.

    • An observed release sediment or aqueous sample for the human food chain can document actual contamination only if it contains a substance with a BPFC of 500 or greater.
    • The aqueous benchmarks for the drinking water and the environment threats a different and the food chain threat requires tissue samples for Level I.

  • An aqueous sample with TCE at 100 ug/l gives different results for each threat.

Drinking Water Level I against a benchmark of 5 ug/l
Human Food Chain Potential because BPFV is only 50

  • For the surface water pathway, it may be worthwhile to make a base map that shows the surface water bodies and the sampling points and then to make a map for each threat that shows the interpretation of the sampling points (Level I, Level II, Potential) and the targets associated with the threat.

  • The score for the surface water pathway is the sume of the three threats, capped at 100.

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